Method and system for recovering copper, zinc and cyanide in cyanidation gold extraction of high-copper gold mines

A cyanide and gold ore technology, applied in the direction of improving process efficiency, can solve problems such as environmental pollution, unsuitability for high copper-containing gold ore, etc., and achieve economic benefits, reduce the amount of cyanide, and reduce the amount of investment. Effect

Active Publication Date: 2017-06-06
中城华宇(北京)矿业技术有限公司
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Problems solved by technology

[0005] The present invention provides a method and system for recovering copper, zinc and cyanide in the cyanidation gold extraction of high-copper-gold ores, which are used to solve technical defects such as the method in the prior art is easy to cause environmental pollution and is not suitable for high-copper-containing gold ores.

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  • Method and system for recovering copper, zinc and cyanide in cyanidation gold extraction of high-copper gold mines
  • Method and system for recovering copper, zinc and cyanide in cyanidation gold extraction of high-copper gold mines

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Embodiment 1

[0034] The process flow diagram of the method for reclaiming copper zinc and cyanide in the cyanidation gold extraction of high-copper gold ore of the present embodiment is as follows figure 1 As shown, the method includes steps performed in the following order.

[0035] 1. Gold leaching in cyanide

[0036] Wet grinding of gold placer (copper and gold symbiotic ore, copper content is about 16%), so that the ore particles below 200 mesh in the gold ore account for more than 90%, and then concentrated, and the concentration of the pulp is 45% About, add lime milk to the pulp as a protective base and maintain the pH of the pulp at about 12; under stirring conditions, use a sodium cyanide solution with a concentration of 0.3% and an oxygen content of 8 mg / L in the cyanide pool to The above pulp is leached, and after leaching for 48 hours, the formed leachate is filtered to produce gold-containing precious liquid.

[0037] 2. Ultrafiltration and Nanofiltration

[0038] The ultra...

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Abstract

The invention provides a method and system for recycling copper zinc and cyanide from high-copper gold ore cyanide gold refining. Sodium cyanide is adopted to leach copper-bearing gold ore, ultrafiltration and nanofiltration membrane concentration are carried out on a leaching agent, concentrated acid and dissolvable sulfide are sequentially put into concentrated liquor, Cu2S (copper sludge) is produced, the copper sludge can be recycled after water removal, and copper-dissolved sodium cyanide is recycled synchronously; lime milk is added into a liquid supernatant to adjust the pH value, the liquid supernatant obtained after solid-liquid separation is mixed with the nanofiltration membrane leaching agent, and then has a replacement reaction with zinc powder to generate gold, ultrafiltration and nanofiltration membrane concentration are carried out on a barren solution, concentrated acid and soluble sulfide are put into concentrated liquor sequentially, ZnS (zinc sludge) is generated, and recycled after water removal, and zinc-dissolved cyanide is recycled synchronously; and the lime milk is added into the liquid supernatant to adjust the pH value, and the liquid supernatant obtained after solid-liquid separation is mixed with the nanofiltration membrane leaching agent and returns to a leaching pool. The copper zinc and the cyanide are recycled, and therefore the problem that copper-bearing gold ore is high in leaching cost is solved; and meanwhile, the zero discharging of the cyanide liquid in the whole technology is achieved.

Description

technical field [0001] The present invention is an improved cyanide gold extraction method and system, specifically a method and system for recovering copper, zinc and cyanide in cyanide gold extraction of high-copper gold mines, which can recover copper and zinc in cyanide gold extraction metals and cyanides. Background technique [0002] Merrill-Crowe cyanide gold extraction is the most commonly used method for extracting gold from gold mines in modern times. It has been used since 1889 and has a history of more than 100 years. It has the advantages of simplicity, economy, high recovery rate, and strong adaptability. The cyanidation gold extraction process usually includes a leaching process and a zinc powder replacement process. The leaching process is to leaching gold ore with a cyanide solution under the condition of sufficient oxygen supply, so that gold and cyanide form a gold complex and dissolve to produce precious metals. In addition, in order to maintain the stab...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B11/08C22B15/00
CPCY02P10/20
Inventor 袁欣波谢祖宁程涛
Owner 中城华宇(北京)矿业技术有限公司
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